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Cortical activity modulation of language processing by dynamic optimization of task complexity and functional restrictions 17
Shantanu Ghosh; Amrita Basu; Subash Khushu; Senthil S. Kumaran.
Language, regarded as a hierarchical cognitive code activated by functional operational modes of the brain by most neuropsychologists, is characterized by increased cognitive load in successively higher levels of processing. Language comprehension is posited to be executed through symbolic-iconic information being encoded neurally as modulated phenomena, and can be studied _in vivo_ by functional brain imaging. Using a lexical decision-making task in conjunction with syntactic error correction that effectively isolated the regulatory neural substrate of processing structural-functional information, and minimizing the possible confounds of gender and proficiency, functional magnetic resonance imaging (fMRI) was performed on bilingual volunteers to ascertain...
Tipo: Manuscript Palavras-chave: Neuroscience.
Ano: 2009 URL: http://precedings.nature.com/documents/3941/version/1
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To every man his own language: Are we all Darwin’s children? 17
Shantanu Ghosh.
Although current theories of language evolution have examined both molecular evolution as well as functional connectivity of the cortex in humans as well as other primates, a description of language as pre-adaptation open to natural selection has eluded us so far. Here I review the evidence in favor of natural selection that trigger growth and plasticity of the prefrontal cortex in humans and its links to the mirror neuron system. Evolvability of recursive mechanisms as the hallmark of evolution of symbolic communication in humans is also investigated. The polymorphism of genes like ASPM, Microcephalin and FOXP2 in the evolution of language as an emergent property has also been examined.
Tipo: Manuscript Palavras-chave: Evolutionary Biology.
Ano: 2007 URL: http://precedings.nature.com/documents/1375/version/1
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